Superheated water vapor enters and insulated turbine operating at steady state at 20 bar and 400 °C and exits at 1.5 bar. The quality of the substance at the exit is 0.98. Neglect change of potential energy and kinetic energy.
(1) Find the work delivered by the turbine per unit mass of water in kJ/kg.
(2) By calculating the entropy produced in this cycle, determine if this expansion internally reversible or irreversible or impossible?